The average computer user might think that the number of languages their operating system supports is pretty long. OSX supports 22 languages, and Microsoft claims to support 96, but they're counting different regional dialects multiple times. But there are over 6000 languages, and though many of them are spoken by a dwindling few, there are some languages that are spoken by millions of people that are supported very poorly, if at all, by computer operating systems. The reason for the support being poor is that the people who speak those languages are poor, and are not good "markets." It's only because of the efforts of a few dedicated people that computing support for languages such as Burmese, Sinhalese, Pali, Cambodian, and Lao have been as good as they are, but the trends for the future are not good.

Even when English gets various forms of dialect support, we'll never, EVER see support for the Appalachian dialect; despite there being millions of speakers. I think that social prejudice is as much of an issue as "poor markets".

Speaking as a native of the north Georgia mountains, which Appalachian dialect are you referring to? There are a couple of distinct ones just in my neck of the woods, and the further northeast you go the more you hear. My biological father was from the North Carolina mountains and his family's dialect was vastly different from what people speak here.